The CaRT (Campus and Remote Tower)/iWAN-NG (integrated Wide Area Network - New Generation) project aims to upgrade existing national IP-based ground-ground data communications network in order to support information exchange (SWIM) according to new European standards on information exchange and services at Croatia Control. Additionally, it aims at enabling advanced QoS (Quality of Service) functionality to support Voice over Internet Protocol (VoIP) based voice communications. The scope of this IP is the second phase of the Implementation Project which is linked to IP 2015_047_AF5 currently implemented under CEF Call 2015 (Action 2015-EU-TM-0197-M). The second phase continues the implementation initiatives including supply and installation of a new national IP-based ground-ground data communications network in line with the detailed design recommendation from the first phase. The implementation phase comprises detailed validated system design for network, delivery of hardware and software, installation, set - up and integration and training of CCL personnel.